body {
    font-family: Arial, sans-serif;
}

.container {
    text-align: center;
    margin-top: 50px;
}

.ball {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    background-color: #4CAF50;
    color: white;
    font-size: 18px;
    margin: 10px;
    text-align: center;
}

.powerball {
    background-color: red;
}

.error {
    color: red;
}